Acoustic, thermodynamic, viscometric and volumetric studies in binary systems of 1-decanol with n-hexane, n-octane and n-decane with respect to temperature

Abstract

Densities, ρ, viscosities, η, and speeds of sound, u of pure 1-decanol, C 10H 21OH, n-hexane, C 6H 14, n-octane, C 8H 18, n-decane, C 10H 22 and their binary mixtures with 1-decanol as a common component, were measured at 298.15, 303.15 and 308.15 K over the entire composition range. These experimental data were used to calculate the values of excess molar volumes, V m E, excess molar isentropic compressibility, K s,m E, deviation u D of the speeds of sound from the values u id calculated for ideal mixtures, Gibbs excess free energy of activation of viscous flow, ΔG ⁎E, free volume, V f , free length, L f , acoustic impedance, Z, molar sound speed, R m, relative association, R A, and molecular association, M A. These parameters, especially excess functions, are found to be quite sensitive toward the intermolecular interactions in liquid mixtures. The excess functions and deviations have also been correlated using Redlich–Kister type polynomial equation by the method of least-squares for the estimation of the binary coefficients and the standard errors.